Controlling device for machine tools, particularly grinding machines



June 18, I929. JUNG I 1,717,385 CONTROLLING DEVICE FOR MACHINE TO OL5,'PARTICULARLY GRINDING MACHINES Filed April 27, I92? 2 Sheets-Sheet l.

I nv-enior June 18, 1 929. K, J N'G 1,717,385

A CONTROLLING DEVICE FOR MACHINE TOOLS, PARTiCULARLYGRINDING MACHINESFiled April 2'7, 192? 2 Sheets-Sheet 2 IIIIIIIIIIIIIIIIIII/IIIIIIIIAVAVA i V///////// II-m I In venfoz':

Patented June 18, 1929.

PATENT OFFICE.

KARL JUNG, or BERLIN, GERMANY.

. CONTROLLING DEVICE FOR MACHINE TOOLS, PARTICULARLY GRINDING MACHINES.

Application filed April 27, 1927,-S;erial No; 187,028, and in GermanySeptember 18, 1926.

In machine tools, in which a movement is imparted in' a longitudinal andtransverse direction to a sliding carriage serving for the securement ofthe work-piece or tool,

hitherto the parts effecting this movement have been driven as a rule bythe driving or transmission shaft by the intercalation of suitable geardevices or couplings. The reversing operation at the end of the travelin this event takes place preferably by means of a stop, adjustablysecured to the slidlng carriage, which strikes against a control lever,residing in communication with the controlling device, and shifts thesame. In

this arrangement the active force of the sliding carriageat the end ofthe travel is not sufficient to perform the reversing operation,

so that special spring devices or the like have to be provided, inwhich, upon movement of the sliding carriage, excess force serving toeffect the reversing operation ,is accumulated. K

The present invention dispenses with these unreli'ably operatin springdevices in that 2 the longitudinal slide at the end ofits travel putsinto circuit a special, prefer: ably hydraulic, source of power, whichthen in turn effects the reversing operation of the longitudinal traveland in given cases may also setinto operation the transverse travel.

The operation of the longitudinal travel according to the inventiontakes place hydraulically and preferably by means of two dis sociatedpressure' 'pistons to which the pressure fluid is conducted through acommon pump,. while a special pump is provided as --the source of powerfor the control of the transverse travel and for the eflectuation of thereversing operation. The accompanying drawing illustrates an "example ofan embodiment of the invention for a grinding machine in which Fig. 1 isa side view of the machine partly in section, 46 Fig. 2 is a frontviewfpartly in section, the upper part of the frame being'broken away, h

Fig. 3 is a section through Fig. 2 on the direction "of the line 3-3,Fig. '4 is a vertical sectionthrough the housing of the controllingapparatus, while Figs. 5 and 6,illustrate longitudinal sections through;Fig. 4 in the direction of the lines 5- and 6-6 respectively.

Fig. 7 illustrates a section through Fig. 5 along the line 7-7 and hFig. 8 a partsection through Fig. 7 along the line 8- 8.

In the drawing 1 is the housing of the controlling apparatus which islocated in suitable manner in the grinding machine and upon which theslides 50, 51 carrying the work-piece are moved along. The tool 53 isrotatably mounted in the frame 54 of the machine. In the housing (Fig.5) 1 are located two pumps of suitable construction, preferably toothedwheel pumps 2 and 3, which are set into rotation from a driving shaft 6by means of a worm 4 and worm wheel 5. The pressure medium, for exampleoil or the like, drawn up by the pumps 2 and 3 gains access to thepressure leads 7 and 8 respectively. The pressure lead 8 leads to apassage 9 in the housing 1 (see Fig. 6) which discharges into an inletopening 10 located in a cylindrical sleeve 11 in a passage in thehousipgl. lVithin the sleeve slide two rigidly connected regulatingpistons 13 and 14, having a central pgvalve 12,. which controls theinflow or outflow of the pressure fluid to two channels 15 and 16 incommunication with a cylindrical chamber 1.7 as well as two outflowopenings 22 and 23. Through the nected with the sleeve 11 by means oftwo channels 49 and 49.

The shaft 26 at its outer endprojecting outside the housing 1 carriesthe outer end of a lever 27 which extends into the path of two adjustble stops fixed in a known manner 'to the longitudinal slidingcarriage '51, not

shown on the drawing, oris in communication with a stop lever located inthe path of the stops.

The shaft 18 led through the cylinder 17 extends on the one hand into arecess 28 of the housing 1 for the reception of known driving means forthe travel of the sliding carriage 50 in transverse direction,containing for example a ratchet drive 55, and forms on the endprojecting through the cover 21 a pin 29 upon which an eccentric disc 30is rigidly mounted. Surrounding the eccentric disc 30 is located thering-shaped formed end 31 of a lever 32, which at the other end isarticulated to the free end of a swinging lever 34 secured to a swingingshaft 33. The swingin g shaft 33 is rotatably mounted in the housing 1and carries a second swinging lever 35 to which is linked a link 36which on the other hand is articulated to a regulating piston 37. Theregulating piston 37 is in communication with two further regulatingpistons 38 and 39 and slides together with these in a sleeve 40 locatedin the housing 1 which presents a central inlet opening 41 as well astwo channels 42 and 43 located in the housing 11 communicating withopenings 44 and 45.

Apart from this two further outlet openings 46 and 47 are provided inthe sleeve 40. The channels 42 and 43 each lead by means of pipe lines56, 57 to separate pressure cylinders 58, 59 of which the pistons60, 61operates the longitudinal travel of the sliding carriage 51 in one orthe other direction, The inlet opening 41 is in communication with achannel 48 to which is conducted the pressure fluid through the pressurelead 7 of the toothed wheel pump 2-.

The operation of the apparatus is as fol- Through the pump 2 is suppliedpressure fluid, drawn from a reservoir or flowing by gravity, throughthe pressure lead 7 and the channel 48 into the cylinder sleeve40 and,in the position of the regulatingpiston shown in Fig; 2 in the drawing,flows through the opening 44 into the'channel 42 and the pressurecylinder 59" in communication therewith of whleh the piston 61 isoperated and moves the longitudinal slide 51 of the machine.

As soon as the slide comes near the end of its travel ajstop fixedthereupon strikes against the lever 27 or a stop lever in communicationtherewith and swings it laterally,

whereby this movement is transmitted through the shaft 26 to theswinging lever 25.

Consequently the regulating pistons 13 and 14 shown in a centralposition in the drawing are moved for example upwardly together with thevalve 12 so that the pressure fluid supplied through the pump 3 flowsfrom the channel 9 through the opening 10 and the channel 16 into thecylindrical chamber 17 and sets the piston 19 into rotation, whereby-'-the fluid located at the other side of the piston 19 escapes throughthe channel 15 into the cylinder sleeve 11, and flows freely through theoutflow opening-22. As the piston 19 is the outermost position the fluidalso espesthrough the channel 49, thereby discharging? the piston onboth sides. By the rotation of the piston 19 the shaft 18 is alsorotated about the same angle and operates the controlling device 55 forthe transverse travel not fully shown in the drawing in the usual knownmanner. Simultaneously the eccentric disc 30 fixed to the end pin 29 ofthe shaft 18 rotates and effects a downward,

movement of the eccentric lever 32 which has as a result a rotation ofthe swinging levers 34 and 35 about the axis of the shaft 33. I

The downward movement of the free end of the lever 35 thus eifected andthe lever 36 linked thereto effects a movement of the regulating pistons37, 38 and 39 downwards, upon which on the one hand the flow of fluidfrom the channel 41 into the channel 42 is curtailed and brought ,intocommunicationv with the outlet opening-47' and on the other hand thechannel 43 hitherto in communication with the outlet opening 46 isconnected to the channel 41. There is thus efi'ected a reversing of'thelongitudinal travel of the sliding carriage 51, so that the slidingcarriage is moved in the opposite direction by the piston of thepressure cylinder 58 in communication with the channel 43, until thestop provided strikes against the lever 27 at the end of the travelwhereupon the entire procedure is repeated in the opposite direction.

The invention is of course not limited to the embodiment illustrated,the arrangement,

certained the nature of my said invention and in what manner the same isto be performed, I declare, that what I claim is 1'; Acontrollin devicefor machine tools, particularly grin ing machines comprising, incombination with a sliding carriage, 11ydraulic means for moving saidcarriage to and fro, a separate hydraulic source of power independent ofsaid means controlled by said carriage at the end of its travel andmeans energized by said source of power and reversing the travel of thecarriage.

2. A controllin device for machine tools,

particularly grinding machines, comprising,

in combination with a longitudinal sliding carriage and a transversecarriage, hydraulic means for moving said longitudinal carriage to andfro, a separate hydraulic source of power independent of said meanscontrolled by the said longitudinalcarriage at the end of its travel,means for effecting the travel of the transverse carriage and meansenergized by sieid source of power and being adapted to effect, reverseof the travel of the said longitudinal carriage and simultaneously tooperatejsaid means for effecting the travel of 5 the tzl'ansversecarriage.

- A controlling device for machine tools,

particularly grinding machines, comprising,

in combination with a sliding carriage, two hydraulically operatedcylinders one for the of said carriage, a common pump supplying pressurefluid to both cylinders," a separate hydraulic source of powercontrolled by said carriage at the end of its travel and meansenergiz'edby. said source of power and reversing the travel of thecarriage.

4. A controllin device for machine tools, partic {larly grindingmachines, comprising, in combination with a longitudinal sliding 20carriage, hydraulic means for moving said longltudlnal carr age to andfro, a separate in combination with a sliding carriage, means for movingsaid carriage to and ho, a sepa-,

rate hydraulic source of power independent forward and one for thebackward movement of said means controlled by said carriage attheend ofits travel a cylinder, the one or the other side of WlllCll being openedto the flow of the pressure fluid delivered by said hydraulic source ofpowerunder the control of said longitudinal carriage at the end of itstravel, a rotating piston within said cyl- 1 inder operated by saidpressure fluid and adapted to control the reverse of the travel of saidlongitudinal carriage.

6. A controlling device for machine tools, particularly grin ingmachines comprising, in combination with a longitudinal sliding carriageand a transverse carriage, means for -mov1ng-sa1d longltudlnal carriageto and fro,

a separate hydraulic source of power independent of said means, acylinder, the one or the other side of which bein opened to delivered bythe flow of the pressure fluid said hydraulic source of powerunder thecontrol of said longitudinal carriage at the end of its travel, arotatingpiston within said cylinder operated by said pressure fluidmeans for eflecting the travel of said transverse carriage, said pistonbeing adapted to effect the reverse of the travel of the saidlongitudinal carriage and simultaneously to operate said means foreffecting the travel of the transverse carriage.

In testimony whereof I have aflixed my signature.

KARL mm.

